Abstract : The current version of the Rotorcraft Flight Simulation Program C81, AGAP80, was installed in a CDC converted form on the CDC CYBER 175/CDC 6600 Computer System at NAVAIRDEVCEN. The problems encountered in validating this CDC conversion, using the TR-80-38A User's Manual sample case as a test case, are described. The program capabilities in the area of Flight Dynamics analysis are repeated as a quick guide to the user in order to maintain continuity with the USAAVRADCOM-TR-80-D-38A User's Manual. This report is not meant to supersede TR-80-D-38-A. An effort is made throughout the description of the program capabilities to provide the user with a description of the inputs required to perform that particular program operation and the output data that resulted. The user is referred to the TR-80-D-38A User's Manual for the information necessary for assembling a complete input data deck and to successfully execute the program. There were two program operation problems identified while running test cases on this CDC conversion of the AGAP80 version. These two were the inability to perform any of the postprocessing operations of GDAP80 and the inability to compute eigenvalues in the rotorcraft stability analysis. The cost of running this program at NAVAIRDEVCEN to perform a trimmed flight analysis, a rotorcraft stability analysis, and a maneuver simulation is discussed.